drivers/s390/cio/qdio_debug.c

   1 /*
   2  *  drivers/s390/cio/qdio_debug.c
   3  *
   4  *  Copyright IBM Corp. 2008
   5  *
   6  *  Author: Jan Glauber (jang@linux.vnet.ibm.com)
   7  */
   8 #include <linux/proc_fs.h>
   9 #include <linux/seq_file.h>
  10 #include <linux/debugfs.h>
  11 #include <asm/qdio.h>
  12 #include <asm/debug.h>
  13 #include "qdio_debug.h"
  14 #include "qdio.h"
  15
  16 debug_info_t *qdio_dbf_setup;
  17 debug_info_t *qdio_dbf_error;
  18
  19 static struct dentry *debugfs_root;
  20 #define MAX_DEBUGFS_QUEUES      32
  21 static struct dentry *debugfs_queues[MAX_DEBUGFS_QUEUES] = { NULL };
  22 static DEFINE_MUTEX(debugfs_mutex);
  23 #define QDIO_DEBUGFS_NAME_LEN   40
  24
  25 void qdio_allocate_dbf(struct qdio_initialize *init_data,
  26                        struct qdio_irq *irq_ptr)
  27 {
  28         char text[20];
  29
  30         DBF_EVENT("qfmt:%1d", init_data->q_format);
  31         DBF_HEX(init_data->adapter_name, 8);
  32         DBF_EVENT("qpff%4x", init_data->qib_param_field_format);
  33         DBF_HEX(&init_data->qib_param_field, sizeof(void *));
  34         DBF_HEX(&init_data->input_slib_elements, sizeof(void *));
  35         DBF_HEX(&init_data->output_slib_elements, sizeof(void *));
  36         DBF_EVENT("niq:%1d noq:%1d", init_data->no_input_qs,
  37                   init_data->no_output_qs);
  38         DBF_HEX(&init_data->input_handler, sizeof(void *));
  39         DBF_HEX(&init_data->output_handler, sizeof(void *));
  40         DBF_HEX(&init_data->int_parm, sizeof(long));
  41         DBF_HEX(&init_data->flags, sizeof(long));
  42         DBF_HEX(&init_data->input_sbal_addr_array, sizeof(void *));
  43         DBF_HEX(&init_data->output_sbal_addr_array, sizeof(void *));
  44         DBF_EVENT("irq:%8lx", (unsigned long)irq_ptr);
  45
  46         /* allocate trace view for the interface */
  47         snprintf(text, 20, "qdio_%s", dev_name(&init_data->cdev->dev));
  48         irq_ptr->debug_area = debug_register(text, 2, 1, 16);
  49         debug_register_view(irq_ptr->debug_area, &debug_hex_ascii_view);
  50         debug_set_level(irq_ptr->debug_area, DBF_WARN);
  51         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf created");
  52 }
  53
  54 static int qstat_show(struct seq_file *m, void *v)
  55 {
  56         unsigned char state;
  57         struct qdio_q *q = m->private;
  58         int i;
  59
  60         if (!q)
  61                 return 0;
  62
  63         seq_printf(m, "device state indicator: %d\n", *(u32 *)q->irq_ptr->dsci);
  64         seq_printf(m, "nr_used: %d\n", atomic_read(&q->nr_buf_used));
  65         seq_printf(m, "ftc: %d\n", q->first_to_check);
  66         seq_printf(m, "last_move: %d\n", q->last_move);
  67         seq_printf(m, "polling: %d\n", q->u.in.polling);
  68         seq_printf(m, "ack start: %d\n", q->u.in.ack_start);
  69         seq_printf(m, "ack count: %d\n", q->u.in.ack_count);
  70         seq_printf(m, "slsb buffer states:\n");
  71         seq_printf(m, "|0      |8      |16     |24     |32     |40     |48     |56  63|\n");
  72
  73         qdio_siga_sync_q(q);
  74         for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++) {
  75                 get_buf_state(q, i, &state, 0);
  76                 switch (state) {
  77                 case SLSB_P_INPUT_NOT_INIT:
  78                 case SLSB_P_OUTPUT_NOT_INIT:
  79                         seq_printf(m, "N");
  80                         break;
  81                 case SLSB_P_INPUT_PRIMED:
  82                 case SLSB_CU_OUTPUT_PRIMED:
  83                         seq_printf(m, "+");
  84                         break;
  85                 case SLSB_P_INPUT_ACK:
  86                         seq_printf(m, "A");
  87                         break;
  88                 case SLSB_P_INPUT_ERROR:
  89                 case SLSB_P_OUTPUT_ERROR:
  90                         seq_printf(m, "x");
  91                         break;
  92                 case SLSB_CU_INPUT_EMPTY:
  93                 case SLSB_P_OUTPUT_EMPTY:
  94                         seq_printf(m, "-");
  95                         break;
  96                 case SLSB_P_INPUT_HALTED:
  97                 case SLSB_P_OUTPUT_HALTED:
  98                         seq_printf(m, ".");
  99                         break;
 100                 default:
 101                         seq_printf(m, "?");
 102                 }
 103                 if (i == 63)
 104                         seq_printf(m, "\n");
 105         }
 106         seq_printf(m, "\n");
 107         seq_printf(m, "|64     |72     |80     |88     |96     |104    |112    |   127|\n");
 108         return 0;
 109 }
 110
 111 static ssize_t qstat_seq_write(struct file *file, const char __user *buf,
 112                                size_t count, loff_t *off)
 113 {
 114         struct seq_file *seq = file->private_data;
 115         struct qdio_q *q = seq->private;
 116
 117         if (!q)
 118                 return 0;
 119
 120         if (q->is_input_q)
 121                 xchg(q->irq_ptr->dsci, 1);
 122         local_bh_disable();
 123         tasklet_schedule(&q->tasklet);
 124         local_bh_enable();
 125         return count;
 126 }
 127
 128 static int qstat_seq_open(struct inode *inode, struct file *filp)
 129 {
 130         return single_open(filp, qstat_show,
 131                            filp->f_path.dentry->d_inode->i_private);
 132 }
 133
 134 static void remove_debugfs_entry(struct qdio_q *q)
 135 {
 136         int i;
 137
 138         for (i = 0; i < MAX_DEBUGFS_QUEUES; i++) {
 139                 if (!debugfs_queues[i])
 140                         continue;
 141                 if (debugfs_queues[i]->d_inode->i_private == q) {
 142                         debugfs_remove(debugfs_queues[i]);
 143                         debugfs_queues[i] = NULL;
 144                 }
 145         }
 146 }
 147
 148 static struct file_operations debugfs_fops = {
 149         .owner   = THIS_MODULE,
 150         .open    = qstat_seq_open,
 151         .read    = seq_read,
 152         .write   = qstat_seq_write,
 153         .llseek  = seq_lseek,
 154         .release = single_release,
 155 };
 156
 157 static void setup_debugfs_entry(struct qdio_q *q, struct ccw_device *cdev)
 158 {
 159         int i = 0;
 160         char name[QDIO_DEBUGFS_NAME_LEN];
 161
 162         while (debugfs_queues[i] != NULL) {
 163                 i++;
 164                 if (i >= MAX_DEBUGFS_QUEUES)
 165                         return;
 166         }
 167         snprintf(name, QDIO_DEBUGFS_NAME_LEN, "%s_%s_%d",
 168                  dev_name(&cdev->dev),
 169                  q->is_input_q ? "input" : "output",
 170                  q->nr);
 171         debugfs_queues[i] = debugfs_create_file(name, S_IFREG | S_IRUGO | S_IWUSR,
 172                                                 debugfs_root, q, &debugfs_fops);
 173         if (IS_ERR(debugfs_queues[i]))
 174                 debugfs_queues[i] = NULL;
 175 }
 176
 177 void qdio_setup_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 178 {
 179         struct qdio_q *q;
 180         int i;
 181
 182         mutex_lock(&debugfs_mutex);
 183         for_each_input_queue(irq_ptr, q, i)
 184                 setup_debugfs_entry(q, cdev);
 185         for_each_output_queue(irq_ptr, q, i)
 186                 setup_debugfs_entry(q, cdev);
 187         mutex_unlock(&debugfs_mutex);
 188 }
 189
 190 void qdio_shutdown_debug_entries(struct qdio_irq *irq_ptr, struct ccw_device *cdev)
 191 {
 192         struct qdio_q *q;
 193         int i;
 194
 195         mutex_lock(&debugfs_mutex);
 196         for_each_input_queue(irq_ptr, q, i)
 197                 remove_debugfs_entry(q);
 198         for_each_output_queue(irq_ptr, q, i)
 199                 remove_debugfs_entry(q);
 200         mutex_unlock(&debugfs_mutex);
 201 }
 202
 203 int __init qdio_debug_init(void)
 204 {
 205         debugfs_root = debugfs_create_dir("qdio_queues", NULL);
 206
 207         qdio_dbf_setup = debug_register("qdio_setup", 16, 1, 16);
 208         debug_register_view(qdio_dbf_setup, &debug_hex_ascii_view);
 209         debug_set_level(qdio_dbf_setup, DBF_INFO);
 210         DBF_EVENT("dbf created\n");
 211
 212         qdio_dbf_error = debug_register("qdio_error", 4, 1, 16);
 213         debug_register_view(qdio_dbf_error, &debug_hex_ascii_view);
 214         debug_set_level(qdio_dbf_error, DBF_INFO);
 215         DBF_ERROR("dbf created\n");
 216         return 0;
 217 }
 218
 219 void qdio_debug_exit(void)
 220 {
 221         debugfs_remove(debugfs_root);
 222         if (qdio_dbf_setup)
 223                 debug_unregister(qdio_dbf_setup);
 224         if (qdio_dbf_error)
 225                 debug_unregister(qdio_dbf_error);
 226 }